js_倒计时去执行函数或则跳转页面

var wait = 5;
$(document).ready(function () {
   returnPage();
});
function returnPage() {
   if (wait == 0) {
      var redirectUrl=$("#redirectUrlHidden").val();
      window.location.href=Global_Sever_url+redirectUrl;
   } else {
      var msgId=$("#msgId").val();
      $("#redirectUrlBtn").html(msgId+"   "+wait + "秒后自动跳转!");
      wait--;
      setTimeout(function () {
            returnPage();
         },
         1000)
   }
}